refactor(bot): bot utilities into separate modules

Moved logging, signal handling, and uptime calculation logic from bot.py into dedicated utils modules for better organization and reusability. Updated imports and usage in bot.py and utils/__init__.py accordingly.

utils/logging.py

@@ -0,0 +1,54 @@
+import logging
+import os
+
+
+class LoggingFormatter(logging.Formatter):
+    black = "\x1b[30m"
+    red = "\x1b[31m"
+    green = "\x1b[32m"
+    yellow = "\x1b[33m"
+    blue = "\x1b[34m"
+    gray = "\x1b[38m"
+    reset = "\x1b[0m"
+    bold = "\x1b[1m"
+
+    COLORS = {
+        logging.DEBUG: gray + bold,
+        logging.INFO: blue + bold,
+        logging.WARNING: yellow + bold,
+        logging.ERROR: red,
+        logging.CRITICAL: red + bold,
+    }
+
+    def format(self, record):
+        log_color = self.COLORS[record.levelno]
+        format = "(black){asctime}(reset) (levelcolor){levelname:<8}(reset) (green){name}(reset) {message}"
+        format = format.replace("(black)", self.black + self.bold)
+        format = format.replace("(reset)", self.reset)
+        format = format.replace("(levelcolor)", log_color)
+        format = format.replace("(green)", self.green + self.bold)
+        formatter = logging.Formatter(format, "%Y-%m-%d %H:%M:%S", style="{")
+        return formatter.format(record)
+
+
+def setup_logger():
+    logger = logging.getLogger("discord_bot")
+    logger.setLevel(logging.INFO)
+
+    console_handler = logging.StreamHandler()
+    console_handler.setFormatter(LoggingFormatter())
+    
+    log_file_path = os.getenv("LOG_FILE", "logs/discord.log")
+    log_dir = os.path.dirname(log_file_path)
+    if log_dir:
+        os.makedirs(log_dir, exist_ok=True)
+    file_handler = logging.FileHandler(filename=log_file_path, encoding="utf-8", mode="w")
+    file_handler_formatter = logging.Formatter(
+        "[{asctime}] [{levelname:<8}] {name}: {message}", "%Y-%m-%d %H:%M:%S", style="{"
+    )
+    file_handler.setFormatter(file_handler_formatter)
+
+    logger.addHandler(console_handler)
+    logger.addHandler(file_handler)
+    
+    return logger